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• Read sample encrypted AAC with FFmpeg

  25 novembre 2024, par rdrmntn

  I'm trying to open a sample encrypted AAC file (packed audio) using FFmpeg APIs.

  


  I can open an unencrypted AAC file using

  


       AVFormatContext* iContext = nullptr;
     avformat_open_input(&iContext, mediaFileName.c_str(), nullptr, nullptr);


  


  I'm also able to open a sample encrypted fmp4 segment using

  


       AVDictionary *options = nullptr;
     av_dict_set(&options, "decryption_key", ssKey.str().c_str(), 0);
     AVFormatContext* iContext = nullptr;
     int ret = avformat_open_input(&iContext, mediaFileName.c_str(), nullptr, &options);


  


  But when trying to open a sample encrypted AAC file I find no way to set the decryption key. When using code snippet above, decryption_key option is not consumed by the demuxer which, according to documentation, means that it is not recognized by the aac demuxer.

  


  An HLS asset with sample encrypted AAC audio track is playable in ffplay so it should be possible to open the format. Anyone has any pointers on how ?

  


• ffmpeg : fixing incorrectly-recorded sample rate

  3 août 2019, par fluffy

  I recorded a live stream using OBS, and my audio sample rate was set to 44.1KHz. Unfortunately, OBS interpreted my device’s audio input as being 48KHz, so there’s a lot of glitchiness and the audio is pitched about 9% higher (which was the case during the stream itself, although none of the viewers realized this was going on at the time).

  Is there a way to use FFMpeg or similar to change the sample rate of the audio stream (and probably remux it), without trying to resample the audio ?

• Muxing files with different run times

  16 novembre 2019, par Dhruv Kanojia

  I’ve got a few files I want to mux.
  File 1 : MP4 File with runtime of 23 Minutes 45 Seconds
  File 2 : MP4 File with runtime of 23 Minutes 39 Seconds
  File 3 : Subtitle File
  File 4 : Subtitle File
  File 5 : Subtitle File
  File 6 : Subtitle File
  File 7 : Subtitle File
  File 8 : Subtitle File
  File 9 : Subtitle File

  I’m trying to mux these files. Now, since there’s a runtime difference, I’m getting weird errors like :

  [matroska @ 0x55e029fbd1a0] Only audio, video, and subtitles are supported for Matroska.
  
  av_interleaved_write_frame(): Invalid argument
  
  Error writing trailer of /root/my_dls/Output/My Vid/1/en-us/1080p/My Video - 1 [Dual Audio].mkv: Invalid argument

  I can mux files with same run time just fine... but, I’m stuck on this one. Can someone help me out here.

  The command I’m using :

  ffmpeg -i "/root/my_dls/Output/My Vid/1/en-us/1080p/My Video - 1 [enUS].mp4" -i "/root/my_dls/Output/My Vid/1/en-us/1080p/My Video - 1 [jaJP].mp4" -i "/root/my_dls/Output/My Vid/1/en-us/1080p/My Video - 1 [enUS] .ass" -i "/root/my_dls/Output/My Vid/1/en-us/1080p/My Video - 1 [itIT] .ass" -i "/root/my_dls/Output/My Vid/1/en-us/1080p/My Video - 1 [esLA] .ass" -i "/root/my_dls/Output/My Vid/1/en-us/1080p/My Video - 1 [frFR] .ass" -i "/root/my_dls/Output/My Vid/1/en-us/1080p/My Video - 1 [esES] .ass" -i "/root/my_dls/Output/My Vid/1/en-us/1080p/My Video - 1 [deDE] .ass" -i "/root/my_dls/Output/My Vid/1/en-us/1080p/My Video - 1 [ruRU] .ass" -i "/root/my_dls/Output/My Vid/1/en-us/1080p/My Video - 1 [ptBR] .ass" -map 1 -map 2 -map 3 -map 4 -map 5 -map 6 -map 7 -map 8  -map 0:v -map 0:a -map 1:a -c copy -metadata:s:a:0 title="English Audio" -metadata:s:a:1 title="Japanese Audio" -metadata:s:a:0 language=eng -metadata:s:a:1 language=jpn -metadata:s:s:0 title="English (US) Subtitle" -metadata:s:s:1 title="Italian Subtitle" -metadata:s:s:2 title="Spanish (Latin America) Subtitle" -metadata:s:s:3 title="French Subtitle" -metadata:s:s:4 title="Spanish Subtitle" -metadata:s:s:5 title="Deutsch Subtitle" -metadata:s:s:6 title="Russian Subtitle" -metadata:s:s:7 title="Portuguese Subtitle"  "/root/my_dls/Output/My Vid/1/en-us/1080p/My Video - 1 [Dual Audio].mkv"